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EP0688598B1 - Dispositif pour mélanger en continu du liquide et de la poudre - Google Patents

Dispositif pour mélanger en continu du liquide et de la poudre Download PDF

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Publication number
EP0688598B1
EP0688598B1 EP95304287A EP95304287A EP0688598B1 EP 0688598 B1 EP0688598 B1 EP 0688598B1 EP 95304287 A EP95304287 A EP 95304287A EP 95304287 A EP95304287 A EP 95304287A EP 0688598 B1 EP0688598 B1 EP 0688598B1
Authority
EP
European Patent Office
Prior art keywords
liquid
powder
mixing
ring plate
rotating disk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95304287A
Other languages
German (de)
English (en)
Other versions
EP0688598A1 (fr
Inventor
Mitsuo Dow Corning Toray Silicone Co. Ltd Hamada
Hideyuki Dow Corning Toray Silicone Co.Ltd. Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DuPont Toray Specialty Materials KK
Original Assignee
Dow Corning Toray Silicone Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dow Corning Toray Silicone Co Ltd filed Critical Dow Corning Toray Silicone Co Ltd
Publication of EP0688598A1 publication Critical patent/EP0688598A1/fr
Application granted granted Critical
Publication of EP0688598B1 publication Critical patent/EP0688598B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/70—Spray-mixers, e.g. for mixing intersecting sheets of material
    • B01F25/74—Spray-mixers, e.g. for mixing intersecting sheets of material with rotating parts, e.g. discs
    • B01F25/743—Spray-mixers, e.g. for mixing intersecting sheets of material with rotating parts, e.g. discs the material being fed on both sides of a part rotating about a vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/912—Radial flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
    • B01F27/2711—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator provided with intermeshing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis

Definitions

  • This invention relates to a device for continuously mixing liquid and powder (hereinafter a continuous liquid-powder mixer). More specifically, it is a continuous liquid-powder mixer that is able to generate lower apparent viscosities for liquid-powder mixtures and is highly adapted for the preparation of low-viscosity products comprising blends of powder fillers in liquid polymers such as liquid silicones.
  • a continuous liquid-powder mixer that is able to generate lower apparent viscosities for liquid-powder mixtures and is highly adapted for the preparation of low-viscosity products comprising blends of powder fillers in liquid polymers such as liquid silicones.
  • Liquid silicone rubber compounds are employed in molding operations such as injection and compression molding. They are also used in various other operations as materials, such as moldmaking materials, and architectural or building sealants. Liquid silicone rubber compounds are viscous mixtures of liquid silicone with a powder filler such as reinforcing silica. As is well known, lower apparent viscosities for these compounds provide a better processability in the aforementioned operations, while higher apparent viscosities impair processability.
  • Liquid silicone rubber compounds with low apparent viscosities are prepared by mixing the highest possible dispersion of powder filler within the liquid silicone rubber.
  • Compact devices that efficiently mix liquid and powder are disclosed in US-A-3 998 433 (JP-A-53038828) and JP-A-2 002 610. These are continuous mixers that contain a scraper-equipped rotating disk which is installed within a casing to divide the interior of the casing into upper and lower mixing compartments.
  • the present invention introduces a continuous liquid-powder mixer that is able to provide lower apparent viscosity values for liquid-powder mixtures.
  • An additional object is to blend larger amounts of powder for a given liquid-powder mixture viscosity.
  • an apparatus for continuously mixing liquid and powder comprising a continuous mixing device, consisting of a feed opening for the introduction of liquid and powder positioned on top of a casing and a discharge outlet located on the bottom of said casing, a rotating disk installed within said casing and thereby separating the casing interior into an upper and a lower mixing compartment, and scrapers fixed on both upper and lower surfaces of said rotating disk, characterized in that said device has a liquid feed line which is connected to said lower mixing compartment, a ring plate installed on the inside wall of the lower mixing compartment, notches furnished in said scrapers on the lower surface of said rotating disk, and the inner edge of said ring plate being inserted into said notches in such a manner that the ring plate does not contact the scrapers and that the scrapers, while in this interpenetrated condition, are able to move relative to the ring plate.
  • the liquid and powder are introduced into the upper mixing compartment and are subjected to a first-stage mixing process by the scrapers installed on the upper surface of the rotating disk.
  • the resulting mixture is then transferred into the lower mixing compartment where it is subjected to a second-stage mixing process by the scrapers installed on the lower surface of the rotating disk.
  • the liquid/powder mixture is subjected to strong shear between the ring plate and the notches in the scrapers as the mixture flows down onto the ring plate. This strong shear improves the quality of our powder dispersion.
  • the apparent viscosity is substantially reduced as a result of this improved dispersion and as a result of the fresh liquid supplied into this zone from the liquid feed line.
  • Liquids which may be subjected to the present invention are exemplified by water, liquid candy with a starch base, edible oils, liquid chemical compounds and liquid polymers.
  • the liquid polymers are exemplified by silicones, polybutadienes, and epoxy resins.
  • the powders are exemplified by wheat flour, metal powders, and powder fillers.
  • the powder fillers are themselves specifically exemplified by fumed silica, wet-process silica, calcium carbonate, and carbon black.
  • the continuous mixer of the present invention is effectively applied to viscous liquids whose viscosity is further raised by the admixture of powder. It is particularly effective when applied to the production of silicone rubber compounds in which microparticulate fillers are blended in large quantities into a liquid polymer such as liquid silicone.
  • Figure 1 is a vertical cross section of a continuous mixer of the instant invention.
  • Figure 2 is a profile view of the continuous mixer of Figure 1 .
  • Figure 3 is the cross section at the A-A level in Figure 1 .
  • Figure 4 is the cross section at the B-B level in Figure 1 .
  • Figure 5 is the cross section at the C-C level in Figure 1 .
  • Figure 1 contains the vertical cross section and Figure 2 contains the profile of a continuous mixer according to our invention.
  • Figures 3 through 5 contain cross sections at the A-A , B-B , and C-C lines, respectively, in Figure 1 .
  • 20 refers to the mixer body and 30 refers to the starting material feed section for the mixer.
  • a cylindrical casing 1 forms the outer shell of mixer body 20 , and a feed opening 2 that receives liquid/powder mixture is installed at the center of the upper plate 1a of this casing.
  • the lower part of the casing forms an inclined surface 1b having the shape of an inverted cone, and a discharge outlet 3 is installed in said inclined surface 1b .
  • a conical element 19 is installed at the center of the bottom of the casing to form an annular V-shaped bottom with the inclined surface 1b .
  • a cylindrical casing 4 forms the outer shell of the starting material feed section 30 .
  • a liquid feed line 5 is connected tangentially at the side of this casing, and a liquid reservoir 6 is formed within the casing.
  • An overflow tube 7 having the shape of an inverted cone is connected on the top of the feed opening 2 on the mixer body 20 . This overflow tube 7 ascends vertically into the liquid reservoir 6 .
  • the lower end of a powder feed conduit 8 faces the inlet to the overflow tube 7 .
  • the starting viscous liquid is fed into the starting material feed section 30 through the liquid feed line 5 , while the starting powder is fed from the powder feed conduit 8 .
  • the liquid supplied from the liquid feed line 5 is first stored in the liquid reservoir 6 in the starting material feed section 30 and then flows down along the inner wall of the overflow tube 7 from its top edge. At this point the liquid is mixed with the powder supplied through the powder feed conduit 8 and descends into the feed opening 2 .
  • a rotating disk 9 is horizontally installed within the casing 1 of the mixer body 20 to face the feed opening 2 .
  • This rotating disk 9 divides the interior of the casing into an upper mixing compartment 10 , where the first-stage mixing operation is implemented, and a lower mixing compartment 11 , where the second-stage mixing operation is implemented.
  • the center of rotation of this rotating disk 9 is fixed on the upper end of a rotating axle 15 .
  • Said rotating axle 15 is supported by an axle bearing 15a and extends to the exterior of the casing 1 .
  • a pulley 16 is fixed at the bottom end of the rotating axle 15 , and the power for rotation is input from a motor (not shown) across this pulley 16 .
  • the preferred range for the rotation rate is 400 to 1,500 rpm.
  • the upper surface, outside edge, and lower surface of the rotating disk 9 each carry three scrapers separated by equal angles (the scrapers in each set are respectively designated 12 , 13 , and 14 ), and the mixture is mixed through the stirring and scraping actions of these scrapers.
  • Mixing occurs as follows: the scrapers 12 in the upper mixing compartment 10 scrape off the mixture adhering to the top plate 1a ; the scrapers 13 scrape off the mixture adhering on the inner wall of the casing at the boundary between the upper mixing compartment 10 and the lower mixing compartment 11 ; and the scrapers 14 in the lower mixing compartment 11 scrape off the mixture adhering on the inclined surface 1b of the casing bottom.
  • the mixer need not have 3 scrapers in each set 12 , 13 , and 14 as shown in the drawings, and any number above one may be employed. Moreover, the scraper sets may all contain the same number of scrapers or may contain different numbers of scrapers, and the scrapers 13 on the outer edge of the rotating disk 9 may even be omitted as desired.
  • the upper surface of the rotating disk 9 may, as necessary, also bear a large number of vertical pins, which through their stirring activity will further promote stirring and mixing.
  • the following structures are installed in the lower mixing compartment 11 to obtain an even greater mixing effect.
  • a liquid feed line 18 is attached tangentially to the side wall of the lower mixing compartment 11 .
  • This tangential attachment to the casing side wall functions to promote the mixing effect exercised by the liquid on the mixture within the casing.
  • the installation position of this liquid feed line 18 preferably defines an open angle theta, measured from the discharge outlet 3 along the direction of rotation of the rotating disk 9 , in the range from 180° to 270°. This facilitates the improvement in mixing effect that is due to the incoming liquid.
  • the scrapers 14 installed in the lower mixing compartment 11 comprise plates or mesh plates that extend both radially and vertically, and notches 14a of the scrapers 14 are installed therein that run radially inward from the outside edge.
  • a ring plate 17 is fixed on the inner wall of the casing 1 facing the position of the notches 14a , and the inner edge of this ring plate 17 is interpenetratingly inserted into the notches 14a .
  • the notches 14a stretch horizontally over a surface of the ring plate 17 which is set in narrow spaces of notches 14a .
  • the mixture After shearing on the ring plate 17 , the mixture then descends onto the inclined surface 1b and is sheared while being scraped by the ends of the scrapers 14 .
  • the resulting additional dispersion of the powder induces a further lowering of the apparent viscosity of the mixture.
  • the fresh supply of starting liquid from the liquid feed line 18 and its shear by the scrapers 14 furnishes an additional lowering of the viscosity.
  • the above-described continuous mixer is therefore able to provide a substantial reduction in the apparent viscosity of the mixture, even when large quantities of powder are to be compounded into the liquid.
  • the 10 weight parts of hydrophobic fumed silica were charged through the powder feed conduit 8 , while the feed of 100 weight parts of hydroxyl-endblocked polydimethylsiloxane were subdivided into 60 weight parts through the liquid feed line 5 and 40 weight parts through the liquid feed line 18 to the lower mixing compartment 11 .
  • One distinctive feature of the continuous mixer of this invention is the fresh supply of liquid through the installation of a liquid feed line into the lower mixing compartment created by the subdividing effect of the rotating disk.
  • Another distinctive feature is the provision of notches in the scrapers in the lower mixing compartment, and the configuration of these notches in such a manner that the inner edge of the ring plate installed on the inner casing wall is interpenetratingly inserted into the notches.
  • the continuous mixer of our invention is therefore able to produce lower viscosity products for a given powder addition and is also able to blend larger amounts of powder for a given viscosity value.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (3)

  1. Appareil pour mélanger, de façon continue, un liquide et une poudre, comprenant un dispositif de mélange continu, constitué d'une ouverture d'alimentation (2) pour l'introduction de liquide et de poudre qui est positionnée à la partie supérieure d'une enveloppe (4), et d'une sortie d'évacuation (3) située sur la partie inférieure de ladite enveloppe, un disque tournant (9) installé à l'intérieur de ladite enveloppe et séparant ainsi l'intérieur de l'enveloppe en un compartiment de mélange supérieur et un compartiment de mélange inférieur (10, 11), et des racleurs (12, 13, 14) fixés sur les deux surfaces supérieure et inférieure dudit disque tournant,
       caractérisé en ce que ledit dispositif comporte une ligne d'alimentation en liquide (18) qui est raccordée audit compartiment de mélange inférieur (11), une plaque annulaire (17) installée sur la paroi intérieure du compartiment de mélange inférieur, des encoches (14a) pratiquées dans les racleurs (14) sur la surface inférieure dudit disque tournant (9), et le bord intérieur de ladite plaque annulaire (17) étant inséré dans lesdites encoches de telle manière que la plaque annulaire n'est pas au contact des racleurs et que les racleurs, tout en se trouvant dans cet état interpénétré, sont en mesure de se déplacer par rapport à la plaque annulaire.
  2. Appareil selon la revendication 1 pour mélanger, de façon continue, un liquide et une poudre, dans lequel un tube de trop plein montant verticalement (7) pour l'alimentation en liquide est raccordé à l'ouverture d'alimentation (2) sur la partie supérieure de l'enveloppe (4) et un conduit d'alimentation en poudre (8) fait face à l'entrée dans ledit tube de trop plein.
  3. Procédé de mélange, de façon continue, d'un liquide et d'une poudre, comprenant l'alimentation, en continu, d'un liquide visqueux et d'une poudre dans un premier compartiment de mélange supérieur (10) dans lequel le liquide et la poudre sont mélangés de façon continue afin de former un premier mélange au cours d'une opération de mélange de première phase au moyen d'un disque tournant (9) qui sépare le premier compartiment de mélange d'un second compartiment de mélange inférieur (11), le premier mélange passe en continu dans un second compartiment de mélange grâce à des premiers moyens à racleurs (12) fixés sur le disque tournant et qui assurent une action de mélange et de raclage, transportant radialement le premier mélange à l'extérieur du disque tournant dans le second compartiment de mélange dans lequel le premier mélange est soumis à un fort cisaillement entre une plaque annulaire (17) et des encoches (14a) dans des seconds moyens à racleurs (14) fixés sur le disque tournant, et est mélangé à un liquide visqueux venant d'être introduit à partir d'une ligne d'alimentation en liquide (18) qui est raccordée au second compartiment de manière à produire en continu un second mélange, dans lequel la plaque annulaire est installée sur la paroi intérieure du second compartiment et dans lequel le bord intérieur de la plaque annulaire est inséré dans les encoches de telle manière que la plaque annulaire n'est pas au contact des seconds moyens à racleurs.
EP95304287A 1994-06-21 1995-06-20 Dispositif pour mélanger en continu du liquide et de la poudre Expired - Lifetime EP0688598B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13905694A JP3591874B2 (ja) 1994-06-21 1994-06-21 液体と粉体の連続混練装置
JP139056/94 1994-06-21

Publications (2)

Publication Number Publication Date
EP0688598A1 EP0688598A1 (fr) 1995-12-27
EP0688598B1 true EP0688598B1 (fr) 1998-01-07

Family

ID=15236459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95304287A Expired - Lifetime EP0688598B1 (fr) 1994-06-21 1995-06-20 Dispositif pour mélanger en continu du liquide et de la poudre

Country Status (7)

Country Link
US (1) US5599102A (fr)
EP (1) EP0688598B1 (fr)
JP (1) JP3591874B2 (fr)
KR (1) KR960000293A (fr)
BR (1) BR9502878A (fr)
CA (1) CA2152244A1 (fr)
DE (1) DE69501365T2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US7888421B2 (en) 2006-08-03 2011-02-15 Wacker Chemie Ag Continuous process for producing crosslinkable organopolysiloxane compositions

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JP2002166154A (ja) 2000-11-30 2002-06-11 Dow Corning Toray Silicone Co Ltd 連続混合装置
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FR2922214B1 (fr) * 2007-10-12 2010-03-12 Spcm Sa Dispositif pour la dispersion dans l'eau de polymeres hydrosolubles, et procede mettant en oeuvre le dispositif
WO2009102955A2 (fr) * 2008-02-13 2009-08-20 Myers Wolin, Llc Appareil et procédé de mélange d'une poudre avec un liquide
BR112012017985B1 (pt) * 2010-02-16 2020-10-27 S.P.C.M. Sa. aparelho para dispersar polímero solúvel em água
JP5357212B2 (ja) * 2011-06-07 2013-12-04 東レ・ダウコーニング株式会社 連続乳化装置および水性エマルジョンの連続的製造方法
JP5882018B2 (ja) * 2011-10-14 2016-03-09 株式会社粉研パウテックス 粉体と液体との連続混合装置
JP2013132572A (ja) * 2011-12-26 2013-07-08 Jtekt Corp 混合分散装置
JP6149360B2 (ja) * 2012-08-23 2017-06-21 株式会社ジェイテクト 蓄電材料の混練装置および混練方法
WO2018170446A1 (fr) * 2017-03-16 2018-09-20 UGSI Chemical Feed, Inc. Système polymère à haute capacité et méthode de préparation de mélanges polymères
CN112808093A (zh) * 2018-05-11 2021-05-18 周春梅 一种基于畜牧营养饲料混合搅拌罐的下料机构及使用方法
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7888421B2 (en) 2006-08-03 2011-02-15 Wacker Chemie Ag Continuous process for producing crosslinkable organopolysiloxane compositions

Also Published As

Publication number Publication date
US5599102A (en) 1997-02-04
CA2152244A1 (fr) 1995-12-22
KR960000293A (ko) 1996-01-25
JPH08975A (ja) 1996-01-09
DE69501365T2 (de) 1998-07-16
JP3591874B2 (ja) 2004-11-24
EP0688598A1 (fr) 1995-12-27
BR9502878A (pt) 1996-01-30
DE69501365D1 (de) 1998-02-12

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